If you did not change the definition of LCDString(), then this procedure accepts exactly one argument, but you have passed two: [LCDString(buff,"V");], namely [buff] and ["V"], which causes he error.
if they worked. I'm not understanding how for an LCD screen so common, with LOTS of different libraries for it, I cannot find one that will work.
Did you try Google Code Archive - Long-term storage for Google Code Project Hosting.? Let me know if u8glib does not work.
Oliver